量子定位系统中捕获与粗跟踪控制研究

Research on Acquisition and Coarse Tracking Control in Quantum Position Systems

首先推导出经过地面站正上方的卫星运行轨道,以及从地面获取的卫星运行轨迹的空间信号函数;然后对整个捕获和粗跟踪过程的控制系统进行离散型模型的建立;采用分行式螺旋扫描捕获策略进行信号捕获,对电流-速度-位置三闭环粗跟踪控制系统进行控制器设计,并在Simulink环境下,对卫星经过地面站可见区域的4个不同阶段,分别进行信号捕获及其粗跟踪两轴信号的系统仿真实验,并对不同情况下的捕获与粗跟踪控制性能进行了对比分析。本文所做研究为后续的精跟踪过程和超前瞄准提供了保障。

The orbit of the satellite passing directly above the ground station and the spatial signal function of satellite trajectory obtained from the ground are deduced first,and then the discrete model is established for the control system of the whole acquisition and coarse tracking process.A spiral scan capture strategy is adopted to capture the signal,and a controller for the current-speed-position three closed loops of coarse tracking control system is designed.The system simulation experiments of signal acquisition and coarse tracking for two axes are carried out respectively under Simulink in four different stages of the satellite passing through the visible area of the ground station.The performances of acquisition and coarse tracking control under different conditions are compared and analyzed.The research in the paper guarantees the following processes of fine tracking processes and advanced pointing.